PLEASE HELP Total world population (billions): 1804 1; 1922 2;
1959 3: 1974 4: 1987 5; 1999 6. Estimates for the
future (billions): 2013 7; 2028 8; 2048 9.
State the number of years taken for each
population increase of one billion (known
and estimated).

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.

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